There are other additions to the v6.5 software besides the VNAV system, including the option for a QUERTY keyboard (your choice in the System – Setup page). This can also be done from the Utilities Page choose VNAV, then enable it from the page that comes up. You must have VNAV Enabled to use the system. There is also a box on this page to enable VNAV. Touch either one to change the default angle or VSI. Touch that tile and the VNAV profile plan comes up, with boxes including VS Target and Flight Path Angle. If you want to change that angle (or the VSI) go to your flight plan and choose menu. When creating a VNAV descent, the default angle is 3°, with a vertical speed corresponding to that angle and your airspeed. The map (right) shows the TOD and the along-track waypoint KOKC – 5. The addition of a descent waypoint to the flight plan (left) is shown 5 nm before KOKC. We chose At or Above, then touched the altitude box and entered 5000 feet on the screen that appeared (right).įig 4. The “type” box says At, but touching that lets you choose At or Above, At or Below, or Between. We want to descend to 5000 feet nearing KOKC so we simply touch the (empty) altitude box next KOKC, which brings up the center screen with three choices (boxes to touch). Figure 3 shows a flight plan from Tulsa to Wichita, through OKC city (left). In this example, the altitudes were entered automatically by the approach (or arrival) procedure but you can enter altitudes manually for the enroute portion of a flight plan. To arm LNAV or LOC approaches use NAV instead of APR. Then arm the glidepath or glideslope (GP in magenta for GPS, GS in green for ILS) with the APR mode on the autopilot. To transition to a final approach course select the CDI according to the approach-ILS or GPS-a few miles before the FAF. So in Figure 2, the selected altitude of 9000 feet must first be lowered as in the G1000 it must be lower than the last VNAV altitude (ALTV), here, at CALLS. To use the autopilot on VNAV descents, you must set the selected altitude lower than the lowest VNAV altitude (just like the G1000), and push the VNAV button on the autopilot before the TOD. The system is also available for experimental aircraft with the G3X Touch EFIS with a VDI bar, and its associated digital autopilots. The appearance now of VNAV in the touch screen navigators has clearly been triggered by the availability of new Garmin digital autopilots (in addition to the older G700 for the G1000 system). Absent that, you will have the VDI indications but must hand fly the vertical portion. Since your vertical position error will create a digital pitch command (similar to a roll steering command for lateral tracking), a digital autopilot is required for coupling to this slope. The V above the bar denotes a VNAV slope, the magenta chevron is the location of the VNAV slope at this location, and the white diamond shows the GPS glideslope for this approach. Top of Descent indicated on the GTN 750 (right) and the VDI and VNAV altitude for LIPTE shown on the G500/600 (left). These features appear on the G500/600 starting with software version v7.30 and on the G5 with software v5.50.įig 2. Note also the white diamond above that, which is the location (above us) of the GPS glidepath. It also shows the VDI bar with a magenta V on top, indicating this is a VNAV slope, and a magenta chevron showing the sloped course is above us. The right picture in Figure 2 shows the TOD on the GTN 750 there, while the left picture of the PFD portion of the G500 or G600 shows the target altitude of 6000 feet for LIPTE. The slope starts at a defined point called the top of descent (marked TOD on the map), and may also display a BOD (bottom of descent). In Figure 1 the procedure altitudes are shown for an LPV approach to Rwy 11L at KTUS. The altitudes with attached slopes are connected to flight plan waypoints, and can be entered either by procedures (step-down altitudes on an arrival or approach, for example) or entered manually. It will also send digital pitch commands directly to a digital autopilot to track that slope. So what exactly is a baro-VNAV system? In a nutshell, it creates sloped courses attached to baro-corrected altitudes at specific waypoints the slopes are displayed on a VDI (vertical descent indicator) on an appropriate EFIS. Again, this system is used only for descents. Now, with v6.50 software, Garmin is bringing this capability to their touch screen navigators: the GTN 650/750. An LPV approach to Tucson is shown here, with step down altitudes on each flight plan waypoint.
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